Photos: Attack On The PentagonFirefighters and soldiers unfurl an AmerFirefighters and soldiers unfurl an American flag from the roof of the damaged side of the Pentagon 12 September 2001 in Washington, DC. A hijacked airplane crashed into the Pentagon 11 September 2001 causing extensive damage and loss of life. AFP PHOTO/Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonA plane crashed into the Pentagon394262 01: Smoke comes out from the west wing of the Pentagon building September 11, 2001 in Arlington, Va., after a plane crashed into the building and set off a huge explosion. (Photo by Alex Wong/Getty Images)

Photos: Attack On The PentagonA plane crashed into the Pentagon394262 07: Smoke comes out from the Southwest E-ring of the Pentagon building September 11, 2001 in Arlington, Va., after a plane crashed into the building and set off a huge explosion. (Photo by Alex Wong/Getty Images)

Photos: Attack On The PentagonFirefighters continue to fight the blazeFirefighters continue to fight the blaze at the Pentagon in Washington, DC 12 September 2001 after a hijacked commercial jet crashed into the building, 11 September 2001. US President George W. Bush said thousands are feared dead in the attack and earlier crashes which collapsed the twin towers of the World Trade Center in New York. AFP PHOTO/Shawn THEW (Photo credit should read SHAWN THEW/AFP/Getty Images)

Photos: Attack On The PentagonFirefighters take a break at the site ofFirefighters take a break at the site of the terrorist attack at the Pentagon 11 September 2001. The terrorists struck the World Trade Center Towers in New York City and the Pentagon. AFP Photo/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonHijacked Jet Crashes into Pentagon394515 02: Smoke pours from the southwest corner of the Pentagon Spetember 11, 2001 after a hijacked commercial airliner crashed into the building in Arlington, VA. (Photo by Journalist 1st Class Mark D. Faram/U.S. Navy/Getty Images)

Photos: Attack On The PentagonThe sky glows orange as the sun rises ovThe sky glows orange as the sun rises over the damaged side of the Pentagon with the US Capitol behind in Washington, DC, 13 September, 2001 . A hijacked airplane crashed into the Pentagon 11 September, 2001 causing extensive damage. AFP PHOTO/ Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonAmerican flags fly as smoke rises from tAmerican flags fly as smoke rises from the Pentagon after an airplane flew into it in Washington, DC 11 September, 2001. Two more airplanes crashed into the World Trade Center twin towers in New York earlier today in a further string of terrorist attacks in the US. AFP PHOTO/JOSHUA ROBERTS (Photo credit should read JOSHUA ROBERTS/AFP/Getty Images)

Photos: Attack On The PentagonSmoke billows from the Pentagon in WashiSmoke billows from the Pentagon in Washington, DC, 11 September, 2001 hours after a hijacked airplane crashed into the building. The Pentagon has a workday personnel of some 24,000, all of which were evacuated following the attack. AFP PHOTO/ Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonAn emergency vehicle fights a fire at thAn emergency vehicle fights a fire at the Pentagon in Washington 11 September, 2001 hours after a hijacked airplane crashed into the Pentagon. AFP PHOTO/ Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonEmergency vehicles stand before the devaEmergency vehicles stand before the devastated Pentagon 11 September 2001 in Washington, DC, hours after a hijacked airplane crashed into the facility, the center of the US military, in a terrorist attack. AFP PHOTO/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonSmoke billows from the Pentagon in WashiSmoke billows from the Pentagon in Washington 11 September, 2001 after an airplane crashed into it. AFP PHOTO/ Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonEmergency personel battle a fire at theEmergency personel battle a fire at the Pentagon in Washington 11 September 2001 after an airplane crashed into it. The five-sided structure, center of the US military, was struck on one side and collapsed. AFP PHOTO/Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonFirefighters take a break at the site ofFirefighters take a break at the site of the terrorist attack at the Pentagon 11 September 2001. The terrorists struck the World Trade Center Towers in New York City and the Pentagon. AFP Photo/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonFirefighters take a break at the site ofFirefighters take a break at the site of the terrorist attack at the Pentagon 11 September 2001. The terrorists struck the World Trade Center Towers in New York City and the Pentagon. AFP Photo/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonUS President George W. Bush (C) and US SUS President George W. Bush (C) and US Secretary of Defense Donald Rumsfeld (L) tour the impact area (rear) at the Pentagon 12 September 2001 where a hijacked airline was crashed into the building as part of a coordinated terrorist attack on the US. AFP Photo Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

Photos: Attack On The PentagonSmoke billows from the Pentagon in WashiSmoke billows from the Pentagon in Washington,DC 11 September, 2001 after a hijacked airplane crashed into it. AFP PHOTO/ Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonThis photo reased by US Department of VeThis photo reased by US Department of Veterans Affairs 14 September 2001 shows the Pentagon burning 11 September with White House in foreground, as viewed from executive offices of the Department of Veterans Affairs in Washington, DC. AFP PHOTO/ROBERT TURTIL (Photo credit should read ROBERT TURTIL/AFP/Getty Images)

Photos: Attack On The PentagonFirefighters retreat from the roof of thFirefighters retreat from the roof of the Pentagon in Washington, DC, 11 September 2001, while fighting the blaze caused by the crash of a hijacked commercial airliner. US President George W. Bush said thousands are feared dead in the attack and earlier crashes which collapsed the twin towers of the World Trade Center in New York. AFP PHOTO/Shawn THEW (Photo credit should read SHAWN THEW/AFP/Getty Images)

Photos: Attack On The PentagonEmergency workers (R) suspended from a cEmergency workers (R) suspended from a crane survey the impact sight of the hijacked commercial airliner early, 12 September 2001, at the Pentagon in Washington, DC. Firefighters continue to fight the blaze at the Pentagon after a hijacked commercial jet crashed into the building, 11 September 2001. US President George W. Bush said thousands are feared dead in the attack and earlier crashes which collapsed the twin towers of the World Trade Center in New York. AFP PHOTO/Shawn THEW (Photo credit should read SHAWN THEW/AFP/Getty Images)

Photos: Attack On The PentagonUS soldiers check vehicles at the NimitzUS soldiers check vehicles at the Nimitz Gate entrance to Pearl Harbor Naval base in Hawaii after all US military installations were put on the highest security posture of "Threatcon Delta" following terrorist attacks on the World Trade Center twin towers and the Pentagon, in Washington DC, earlier 11 September, 2001. Traffic backed up for miles outside Pearl Harbor and Hickam Air Force base in Hawaii as military personnel responded to the Delta security alert. The attacks on New York and Washington DC have been likened to the Pearl Harbor of terrorism in reference to the Japanese surprise attack on Pearl Harbor that propelled the US into World War II. AFP PHOTO Mike NELSON/mn (Photo credit should read MIKE NELSON/AFP/Getty Images)

Photos: Attack On The PentagonSmoke still billows from the Pentagon 11Smoke still billows from the Pentagon 11 September 2001 in Washington, DC, after a hijacked airplane crashed into the facility, nerve center of the United States military. AFP PHOTO/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonA Pentagon official stands across the PeA Pentagon official stands across the Pentagon from which smoke is billowing following an airplane crash 11 September, 2001. More than 30 people were reportedly injured in the terrorist attack and Washington DC has been declared in a state of emergency. AFP PHOTO Olivier Douliery
(Photo credit should read OLIVIER DOULIERY/AFP/Getty Images)

Photos: Attack On The PentagonSmoke billows from the Pentagon in WashiSmoke billows from the Pentagon in Washington, DC, 11 September, 2001, after an airplane crashed into it. At the same time, two passenger planes were crashed into the twin towers of the World Trade Center in new York City. Both towers collapsed. AFP PHOTO/Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonFirefighters take a break at the site ofFirefighters take a break at the site of the terrorist attack at the Pentagon 11 September 2001. The terrorists struck the World Trade Center Towers in New York City and the Pentagon. AFP Photo/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonSmoke still billows from the Pentagon 11Smoke still billows from the Pentagon 11 September 2001 in Washington, DC, after a hijacked airplane crashed into the facility, nerve center of the United States military. AFP PHOTO/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonThis photo reased by US Department of VeThis photo reased by US Department of Veterans Affairs 14 September 2001 shows the Pentagon burning 11 September with White House in foreground, as viewed from executive offices of the Department of Veterans Affairs in Washington, DC. AFP PHOTO/ROBERT TURTIL (Photo credit should read ROBERT TURTIL/AFP/Getty Images)

Photos: Attack On The PentagonFirefighters take a break at the site ofFirefighters take a break at the site of the terrorist attack at the Pentagon 11 September 2001. The terrorists struck the World Trade Center Towers in New York City and the Pentagon. AFP Photo/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonSmoke still billows from the Pentagon 11Smoke still billows from the Pentagon 11 September 2001 in Washington, DC, after a hijacked airplane crashed into the facility, nerve center of the United States military. AFP PHOTO/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonSmoke billows from the Pentagon in WashiSmoke billows from the Pentagon in Washington, DC, 11 September, 2001, after an airplane crashed into it. At the same time, two passenger planes were crashed into the twin towers of the World Trade Center in new York City. Both towers collapsed. AFP PHOTO/Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonSmoke billows from the Pentagon in WashiSmoke billows from the Pentagon in Washington,DC 11 September, 2001 after a hijacked airplane crashed into it. AFP PHOTO/ Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonThis 11 September, 2001, image taken froThis 11 September, 2001, image taken from Malcom X Park in Washington, DC, looking south towards Virginia shows smoke billowing up from fires at the Pentagon. Witnesses report that an aircraft flew into the building. The suspected terrorist attack also hit New York City were the twin towers of the World Trade Center collapsed after being hit by reportedly hijacked airplanes. AFP PHOTO/Keith ANNIS (Photo credit should read KEITH ANNIS/AFP/Getty Images)

Photos: Attack On The PentagonThis image taken from a Pentagon securitWashington, UNITED STATES: This image taken from a Pentagon security camera video and released 16 May 2006 shows the tip of American Airlines Flight 77 partially shown (white area, just below horizon at right) prior to impact into the Pentagon 11 September 2001 in Washington, DC. The Pentagon handed the videos over to Judicial Watch, a watchdog group that sued for its release. The lack of film evidence of the attack had fueled conspiracy theories suggesting that it had been faked or engineered by the Pentagon against itself. AFP PHOTO/DoD (Photo credit should read -/AFP/Getty Images)

Photos: Attack On The PentagonClean -up and rescue work continues at the damagedWASHINGTON, DC - SEPTEMBER 13: Clean -up and rescue work continues at the damaged area at the Pentagon in Washington,DC, during a Congressional tour 13 September, 2001 after the 11 September 2001 terrorist attack . (Photo credit should read SUSAN WALSH/AFP/Getty Images)

Photos: Attack On The PentagonFirefighters take a break at the site of the terroWASHINGTON, UNITED STATES: Firefighters take a break at the site of the terrorist attack at the Pentagon 11 September 2001 in Washington, DC. The terrorist struck the World Trade Center in New York City and the Pentagon. AFP Photo/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)

Photos: Attack On The PentagonOffice workers listen to a radio news broadcast inWASHINGTON, UNITED STATES: Office workers listen to a radio news broadcast in the shadow of the Washington Monument 11 September 2001 in Washington, DC, as smoke billows from the Pentagon (BACKGROUND), nerve center of the US military, following an apparent terrorist attack. AFP PHOTO/Tim SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)

Photos: Attack On The PentagonFirefighters and engineers examine the damaged sidWASHINGTON, UNITED STATES: Firefighters and engineers examine the damaged side of the Pentagon in Washington 12 September 2001 from a bucket attached to a crane. A hijacked airplane crashed into the Pentagon 11 September 2001 causing extensive damage and loss of life. AFP PHOTO/Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonRescue workers continue to labor at the Pentagon 1WASHINGTON, UNITED STATES: Rescue workers continue to labor at the Pentagon 12 September 2001 in Washington, DC, one day after the terrorist attack on the US defence facility. AFP PHOTO/Shawn THEW (Photo credit should read SHAWN THEW/AFP/Getty Images)

Photos: Attack On The PentagonFirefighters stand atop the roof on the damaged siWASHINGTON, UNITED STATES: Firefighters stand atop the roof on the damaged side of the Pentagon in Washington 12 September, 2001. A hijacked airplane crashed into the Pentagon 11 September, 2001 causing extensive damage. AFP PHOTO/Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonA demolished office sits empty on the damaged sideWASHINGTON, UNITED STATES: A demolished office sits empty on the damaged side of the Pentagon in Washington, DC, 12 September, 2001. A hijacked airplane crashed into the Pentagon 11 September, 2001 in a coordinated terrorist attack causing extensive damage and loss of life. AFP PHOTO/ Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonSmoke billows from the Pentagon in Washington,DC 1DC, UNITED STATES: Smoke billows from the Pentagon in Washington,DC 11 September, 2001 after a hijacked airplane crashed into it. AFP PHOTO/ Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

Photos: Attack On The PentagonProgess Of Pentagon ReconstructionNEW YORK - SEPTEMBER 12: A satellite image of the Pentagon was taken at 11:46 a.m. EDT September 12, 2001 by the IKONOS satellite over Washington D.C. The image shows extensive damage to the western side and interior rings of the multi-ringed building. Since all airplanes were grounded over the U.S. after the attack, IKONOS was the only commercial high-resolution camera that could take an overhead image at the time. (Photo by Space Imaging/Getty Images)

Photos: Attack On The PentagonHijacked Jet Crashes into Pentagon394515 03: Military personnel move down highway I-395 while evacuating the Pentagon September 11, 2001 after a hijacked commercial airliner crashed into the southwest corner of the building in Arlington, Virginia. (Photo by Journalist 1st Class Mark D. Faram/U.S. Navy/Getty Images)

Photos: Attack On The PentagonHijacked Jet Crashes into Pentagon394515 01: Medical personnel load a wounded Pentagon worker into an ambulance at the first medical triage area set up outside the Pentagon September 11, 2001 after a hijacked commercial airliner crashed into the southwest corner of the building in Arlington, Virginia. (Photo by Journalist 1st Class Mark D. Faram/U.S. Navy/Getty Images)

Photos: Attack On The PentagonHijacked Plane Slams Into Pentagon in Terror Attack394422 04: A 200-foot gash exposes interior sections of the Pentagon following a suspected terrorist crash of a hijacked commercial airliner into the Pentagon September 11, 2001 in Arlington, VA. The attack came at approximately 9:40 a.m. as the plane, originating from Washington D.C.''s Dulles airport, was flown into the southern side of the building. (Photo by Bob Houlihan/U.S. Navy/Getty Images)

Photos: Attack On The PentagonHijacked Plane Slams Into Pentagon in Terror Attack394422 02: Smoke and flames rise over the Pentagon late into the night September 11, 2001 following a suspected terrorist crash of a hijacked commercial airliner into the Pentagon in Arlington, VA. The attack came at approximately 9:40 a.m. when a plane originating from Washington D.C.''s Dulles airport, was flown into the southern side of the building. (Photo by Bob Houlihan/U.S. Navy/Getty Images)